161857603 has 8 divisors (see below), whose sum is σ = 167302016. Its totient is φ = 156427200.

The previous prime is 161857559. The next prime is 161857609. The reversal of 161857603 is 306758161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161857603 - 2²⁵ = 128303171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161857609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23383 + ... + 29503.

It is an arithmetic number, because the mean of its divisors is an integer number (20912752).

Almost surely, 2^161857603 is an apocalyptic number.

161857603 is a deficient number, since it is larger than the sum of its proper divisors (5444413).

161857603 is an equidigital number, since it uses as much as digits as its factorization.

161857603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7005.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 161857603 is about 12722.3269491080. The cubic root of 161857603 is about 544.9764072496.

The spelling of 161857603 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, six hundred three".